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https://gitlab.kitware.com/vtk/vtk-m
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a1ea509f87
This is required for vtkm::worklet::Invoker to launch worklets with a non default scatter type.
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_worklet_ScatterPermutation_h
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#define vtk_m_worklet_ScatterPermutation_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleConstant.h>
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#include <vtkm/worklet/internal/ScatterBase.h>
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namespace vtkm
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{
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namespace worklet
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{
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/// \brief A scatter that maps input to output based on a permutation array.
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///
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/// The \c Scatter classes are responsible for defining how much output is
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/// generated based on some sized input. \c ScatterPermutation is similar to
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/// \c ScatterCounting but can have lesser memory usage for some cases.
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/// The constructor takes an array of ids, where each entry maps the
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/// corresponding output to an input. The ids can be in any order and there
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/// can be duplicates. Note that even with duplicates the VistIndex is always 0.
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///
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template <typename PermutationStorage = VTKM_DEFAULT_STORAGE_TAG>
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class ScatterPermutation : public internal::ScatterBase
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{
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private:
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using PermutationArrayHandle = vtkm::cont::ArrayHandle<vtkm::Id, PermutationStorage>;
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public:
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using OutputToInputMapType = PermutationArrayHandle;
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using VisitArrayType = vtkm::cont::ArrayHandleConstant<vtkm::IdComponent>;
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ScatterPermutation(const PermutationArrayHandle& permutation)
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: Permutation(permutation)
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{
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}
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VTKM_CONT
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template <typename RangeType>
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vtkm::Id GetOutputRange(RangeType) const
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{
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return this->Permutation.GetNumberOfValues();
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}
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template <typename RangeType>
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VTKM_CONT OutputToInputMapType GetOutputToInputMap(RangeType) const
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{
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return this->Permutation;
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}
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VTKM_CONT OutputToInputMapType GetOutputToInputMap() const { return this->Permutation; }
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VTKM_CONT
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VisitArrayType GetVisitArray(vtkm::Id inputRange) const { return VisitArrayType(0, inputRange); }
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VTKM_CONT
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VisitArrayType GetVisitArray(vtkm::Id3 inputRange) const
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{
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return this->GetVisitArray(inputRange[0] * inputRange[1] * inputRange[2]);
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}
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private:
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PermutationArrayHandle Permutation;
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};
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}
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} // vtkm::worklet
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#endif // vtk_m_worklet_ScatterPermutation_h
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